Thaum Lub Kaum Ob Hlis 16, 2020, kev txhawb nqa los ntawm Tuam Tshoj Fluorosilicon Organic Cov Khoom Siv Kev Lag Luam Association, Huantai County Cov Neeg Tsoom Fwv, Tuam Tshoj Epoxy Resin Industry Association (npaj), Beijing Fluorosilicon Technology Development Co., Ltd., Beijing Guohua New Material Technology Center, Dongfang Un.. .
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